Rubber Helicopter Blades

[JoeySR16]

haha that music with it just great xD

[Brainiaccccc]

wasted my time. When will I learn!

[Voorheesvideo]

Three words, What The Fuck?

[ilvey]

Think about the stage coach wheels going backward...

[54321br14]

wow how would you start it lol

[cjellwood]

rubber would probably make a very efficient rotor. Te centrifugal outward force would keep it rigid lol

[witecracker2]

learned alot!!!

[formattester6]

its caused by a "CMOS" sensor in the camera. to record each frame...the image is scanned from top to bottom instead of all at once. the blade is in its initial position for the start of the scan and already at a different position for the later part of the scan on that "one single frame" (30 fps). in the video world its call "skew". also related terms are "rolling shutter". CCD sensors dont do this but CMOS does and CMOS is becoming more popular.

[Bennyclay661]

thanks genuis

[formattester6]

haha, your welcome!

[hotlava777]

does that mean that CMOS sensor cameras are not suitable for sport / action photography...as compared to a CCD one.

...or are there corrective measures for "skewing"?

[formattester6]

a CCD sensor is definitely better for shooting action especially if you have fast left to right panning. i love my Sony EX1 but it does have limitations. i bought a Panasonic HMC 150 with CCD's for sports type of shooting. with that said if you dont get too crazy with a CMOS sensor camera it will still work and you dont always notice skewing...you just have to play to its limitations. nothings perfect. there are just considerations to consider when shooting CMOS.

[hotlava777]

thanks for the invaluable info. formattester6.

[colonellemon]

I dont know how to put this really, I kinda know one of the reasons why that happens, it could be that the rotors are spinning at a diffrent refresh rate and are in a diffrent hertz frequency compaired to the camera, like when a TV flickers in a camera. And the rotors bend in a helicopter anyway but I think that just made it more extreme.

Anyway was funny to watch, good choice of music

[YusefDeeb69]

haha, trippy

[HellBound8492]

i did an experiment on the ceiling fan....

In a camera phone it does the exact same thing. it's wierd I guess I'll never fully understand trick photography or the "physics" of filming.

[Reds15OO]

haha nice camera

[halliburton69]

could it have been a "fish eye " lens on the camera

[wickedinsight]

yup

[muzmania77]

shite vid

[bbidfan1]

its just a helicopter in slow mo

[superjaysimmons]

bogus

[sebadmx512]

is the cammera scanning. just try the same rotatng a rigid thing front a tv screen, the scanlines does this effect. the rigid thing will bend.

[ConfirmedShot]

This is not an illusion nor a distorted image due to glass. This is the effect of the force exerted from the engine. Watch the tail rotor closely and notice the same, yet the body is not distorted. The engine's actual force is in the front/left of the air craft. This is where the engine is actually stroking. The rest is the follow through. This is why the sound is the strongest behind the craft from the whipping of the blades which carry the rotor around to join again with the engine.

[HellBound8492]

actually no, you can hear a chopper coming miles away. After it passes the sound in gone in a couple moments. The rotor blades are moving faster then the speed of sound depending on altitude. thats why you hear the heavy bass when it's approaching.

[ConfirmedShot]

The sound you hear for miles on the approach of the aircraft is due to a repeated sonic boom. However, observation will tell: the sound is strongest behind the aircraft, even if not longer-lasting.

[Aaron2071]

1. You're probably thinking of the Doppler effect

2. This is caused by the camera they were using. :P

[mhufham22]

impossible

[sdrfgvrfgvsfravgdsvS]

or rubbish camera

[samarigil66]

fake bull shit

[flyboy8492]

lol

[dogofbrown]

guys stfu. ur all dumbasses, its because its slowed down in suh a low speed thats just going round and round The camera is doing it all.

[abhiginimav]

its glass thats doing it aswell. when i flew once, i took a video out the window of the engine, and the blades looked like that on the playback, jsut not slowed down

[Lolstunter]

hahahahahahaha

[SWBF4756294387]

that was dumb

[mmonnerat]

lol some hard friggin fake

[yager1992]

fake

[Hemuliboss]

LOL? Its not fake, its an "illusion,"

[nijelly12345]

hahaha that is awesome

[battleday01]

they just slowed the video down ALOT and then made the blades look like they're turning at different times. pretty cool though!

[nleines]

Camera trick.

[lambertd90]

haha yea every thing seems pretty fucked up on timewarp XD

[fishdude333]

what a great practical joke...LOL

[xlqex]

It could be the way the camera scans the CCD from top to bottom. By the time the bottom rows of pixels are scanned, the rotor has moved to a different place.

[p4n0sgr]

it is a secret experiment

it could be ufo

!

(joking)

[KommieKillah]

Sigh... It's called rotary shutter effect. Common on cheap CMOS cameras (e.g. your cellphone).

[Zwartekaka]

No man. Its because we are all in the matrix.

[Grafbanaan]

I have an anwser for everything and that is photoshop :D

(jokes ;))

[benjiminnnn]

lol

[JudgeBraveStar]

we alkl know it's to do with the framerate of the cameras vs the blade speed but it still looks funky :P

[89danneman89]

The blades are moving faster than what the camera can record.

[kdm865]

its the speed of the camera not the blades...

[dodgedart74]

ahahhahahahaaha, its all about the FPS

[plastabrick]

Fuck my grammar is shocking....

[dcking22]

hes in autorotation... allowing blades to pivot...

[cg19812000]

Mexitaly1512 hit it on the head, As a Helicopter pilot myself, there is 3axes on a fully articulating rotor system and the third is flap. when all 3 are in play, the pilot input, the lead and lag, and the flapping on a rotaing rotor head (the rotor disc) each blade hunts for a perfect position to maximize lift.

[sathan6969007]

you're not a pilot, if you were, you'd know that there is a very simple explanation, the camera that recorded this was in sync with the rotation of the blade sec by sec on each frame, due to recording speed , it gives the apeareance of bending, just like when you hold a pencil between your fingers and move in semi-rotation slowly, it gives the apereance of bending. all due to the fps(frame per second) of recording. in other cases the blades might look like they're not moving at all.

[cg19812000]

Yes i am a helicopter pilot, what you are seeing here is dissymentry of lift and and the guy above is correct with induced drag. I have over 10,300 hours as a pilot in a helicopter and before that was a helicopter mechanic for a military service. this particular effect comes from the lead lag henge and dissymentry of lift on the advancing and retreating sides of the blades. the retreating sides slows down to create lift in the blades and advancing slide speeds up until it becomes a retreating.

[bionichb]

athough your right about the dissymetry of lift due to different relative wind speed between the blades, the speed of the blades with respect to the helicopter are the same (aren't they fixed one 2 another !?). i would rather say the speed that is different and does the difference is the one that is absolute with respect to the ground

[flyboy3633]

FCC Standard hit the nail on the head. Its not blades flexing or the lens. (Nothing else is distorted is it ?. Unlike a film camera which exposes all the grains on the film at (almost) exactly the same time, a video camera writes them to tape using a spinning head that captures the bits in a stream from the top to the bottom of the image. By the time the head is writing the bits at the bottom of the frame the blade has moved to a new position than it was at when the top of the frame was written

[mexitaly1512]

This aircraft has what is called a "fully articulating rotor," where each blade has the ability to rotate on 3 axes. 1 axis is manipulated by the pilot (pitch makes the helicopter go up and down). The other 2 are determined by the spinning rotor head. One of which is depicted in the video is the lead/lag hinge which allows the blade to move forward and back in the plane of rotation, allowing it to find the best point where lift can be created.

[lilflyboy262]

Have you ever held onto a pencil at one end and wobbled it up and down?

Same effect here

[Evangeloz141]

ive done that and ur right

[DawgBone]

It's just the lense of the camera...

Whatever is viewed through the center of the lense looks proportional, everything else is deformed

[freakybuzz]

It's not the lens. It has to do with Video Interlacing. The rotors are spinning faster than the fields can refresh, and at just enough of a proportional phase that they appear to whip around rubber-like as the fields try to keep up on playback.

[xraptor10]

Ding Ding Ding we have a winner ! (Freaky Buzz)

Its all about the video processing,

You see the same sort of effect in digital stills of RC helis.

[plastabrick]

Nar nar nar . . . .thats not it. The Blade has a big heap of induced drag being generated at its outer section toward the tip of the Blade thereby reducing the rate of forward accelleration ( Rpm ) of the Blade tip. This Induced drag suddenly disappears once a certain Rotor Rpm is finally reached. The tip of the rotor then lauches forward at a huge rate and over takes the inner section of Rotor blade. . . .

They call it the Banana effect . . . . not to be mistaken with groung effect....

[wlfee1969]

concave lens.

[robinavion]

ya and how do you explain the fact that nothing else is ddiformed

[ltcolvasquez]

because nothing else is on move

[undertake782]

It's the forces acting on the blades which are stretching it. You know, if your DVD writer goes really fast, it sometimes causes the disk to shatter or expand.

[draaken8]

helicopter rotors and aircraft propellers tend to flex at high speeds

[LiQuidNRG]

lol noob

[Ritter4242]

hmmm i hope you never decide to become a pilot...

[zulkarneym]

helicopter's blade and camera's frame are at same frequency or multiply , heli blade maybe 30 turn in a sec and possible 15 frame per sec camera

[porkman111]

fisheye

[parissiren]

wow dilan4me is a fucking idiot its because they rotate so fast that the camera sees it as they would be flexible, its not fake you dipshit

[chipmunkhippifest]

i actually think it mite because of the slight curve on the lence, thats why they curl more as the helicopter gets nearer and also why the blades only flex in one place.

[daveyt88]

creepy..

[shadowblade145]

wow coolness

[dilan4me]

fake

[keith18ad]

lol this is real man...

some camera afect or blades flexing or something its not fake lmao

[guitaristguy20]

THE MATRIX!

[traxxasrockhead]

that was cool

[earlestdavis]

that was cool

[rasammx]

You need to buy a new cammera nad trow away to the trash that old baccum

[mattialucapd]

Ma chi vuoi prendere per il culo!!??

[subaruimpreza14]

its the way the light reflects of the lens to cause the opticle ilusion

[FCCstandard]

It's a rolling shutter effect. The scanning starts on top to bottom.

The shutter speed is almost in sync with blades.

[NozeDive]

True. And it's pretty sweet!

»Tøny

[hamciucabuca]

lolz nice trick...its just the lens

[yfh10mg]

wtf!!

[Quipeace18]

twf?

[ellioncham]

Nice, Video....This happen if you use a low cost video camera, The low cost video camera can not capture the whole image of the helicopter. you can notice this if you use an old cellphone video camera.